Halogenovinyl-substituted tetra-hydrofuran-2-ones

Abstract

Halogenovinyl-substituted tetrahydrofuran-2-ones of the formula ##STR1## are prepared by reacting a peracid such as peracetic, perpropionic or m-chloroperbenzoic acid with a halogenvinyl-substituted cyclobutanene of the formula ##STR2## in which R 1 to R 8 can be hydrogen, halogen, cyano or various organic radicals, or in pairs can make up a ring. Products wherein R 3 is not hydrogen or R 1 is not halogen are new. The products are useful as intermediates in making insecticides.

What we claim is: 
     
       1. A halogenovinyl-substituted tetrahydrofuran-2-one of the formula ##STR7## in which R 1  and R 2  each independently is hydrogen, chlorine, bromine, fluorine or alkyl or 1 to 4 carbon atoms, R 3  is chlorine, bromine or fluorine,   R 4  is hydrogen or alkyl or 1 to 4 carbon atoms,   R 5  is hydrogen, chlorine, bromine or fluorine and   R 7  and R 8  each independently is methyl or ethyl or together are --(CH 2 ) 3  --, --(CH 2 ) 4  -- or --(CH 2 ) 5  --.